藍天其實是地球大氣層中散射陽光形成的現象

“藍天有多高”這個問題可以從不同角度理解：

大氣層高度

藍天其實是地球大氣層中散射陽光形成的現象。地球大氣層大約有100公里厚度，主要分為對流層、平流層、中間層、熱層和散逸層。我們看到的藍天主要是對流層和平流層的部分，大約從地面到10-50公里高空。

視覺感受上的“高度”

藍天給人的感覺是無邊無際，沒有明確的“高度”界限。因為大氣分布是連續的，隨著高度增加空氣越來越稀薄，藍色也會逐漸變淡，最終在高空（大約100公里以上）變成黑色的太空。

總結：

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藍天的“高度”可以理解為地球大氣層的厚度，主要是幾十公里到上百公里；但從視覺上來說，藍天沒有明確的高度界限，是大氣散射陽光今形成的漸變現象。